In this presentation I will talk about the properties of the
X-ray emitting hot gas in young supernova remnants with an
eye toward drawing connections between the supernova remnant
and the compact object it may contain. Chandra observations
are yielding new insights into nucleosynthesis and other
processes in supernovae that should help in understanding
how the nature of the progenitor star determines the
properties of the ejecta and the compact remnant.